Datasets:
Corpus-NZ
/
Code-Syntax-Expanded

Dataset card Data Studio Files
xet
 Community
wrong_code
stringlengths
3
123
correct_code
stringlengths
3
155
explanation
stringclasses
101 values
language
stringclasses
26 values
echo 'info'
echo 'info';
Add semicolon.
PHP
String name = 'world';
String name = 'world';
Correct.
Dart
List(8,30,23)
List(8,30,23)
Correct.
Scala
<p>hello <b>world</p></b>
<p>hello <b>world</b></p>
Nest properly.
HTML
[91, 39, 67
[91, 39, 67]
Close bracket.
Python
INSERT INTO orders VALUES ('hello',39)
INSERT INTO orders (name, role) VALUES ('hello',39);
Specify columns.
SQL
int[] arr = new int[74]; arr[74] = 5;
int[] arr = new int[74]; if (74 < arr.length) arr[74] = 5;
Check bounds.
Java
{{'id':49, 'age' 63}}
{{'id':49, 'age':63}}
Colon missing.
Python
'14' + 81
14 + 81
Avoid string coercion.
JavaScript
def bar(y): return y + 1
def bar(y): return y + 1
Correct.
Python
b > 26 & z < 9
b > 26 and z < 9
Use 'and' not '&'.
Python
object Item {{ def main(args: Array[String]) = println("info") }}
object Item {{ def main(args: Array[String]): Unit = println("info") }}
Add return type Unit.
Scala
11a = 10
a11 = 10
Variable cannot start with digit.
Python
print 'hello'
print('hello')
Parentheses for function call.
Lua
let data: number = 'message';
let data: string = 'message';
Fix type.
TypeScript
["output", 5]
["output", 5]
Correct.
JSON
function render() {{ echo 'world'; }}
function render() {{ echo 'world'; }}
Correct.
PHP
div {{ color=red; }}
div {{ color: red; }}
Use colon.
CSS
var x int
var x int
Correct.
Go
DELETE FROM users WHERE age=34
DELETE FROM users WHERE age=34;
Add semicolon.
SQL
var x = 74;
var x = 74;
Correct.
Dart
print 'result'
print('result')
print needs parentheses.
Python
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
let num: number | null = null; num.toFixed(24);
let num: number | null = null; if(num!==null) num.toFixed(24);
Null check.
TypeScript
disp('test')
disp('test')
Correct.
MATLAB
if (foo = 80)
if (foo == 80)
Use ==.
C++
function baz(a:string){{return a;}} baz(38);
function baz(a:string){{return a;}} baz('hello');
Pass correct type.
TypeScript
class Child Super:
class Child(Super):
Inheritance uses parentheses.
Python
$arr[98] = 5;
if (isset($arr[98])) $arr[98] = 5;
Check existence.
PHP
JOIN products ON users.id = products.age
JOIN products ON users.id = products.age
Correct.
SQL
switch(temp){{ case 56: break; }}
switch(temp){{ case 56: break; default: break; }}
Add default case.
Java
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
if (item = 2) {}
if (item == 2) {}
Use ==.
Dart
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
if (result = 33)
if (result == 33)
Use ==.
Scala
assert count > 34
assert count > 34
Correct.
Python
if ($val = 5)
if ($val == 5)
Use ==.
Perl
if ($b = 14) {{}}
if ($b -eq 14) {{}}
Use -eq.
PowerShell
jwt.sign({{id:25}}, 'token');
jwt.sign({{id:25}}, 'token', {{expiresIn:'2h'}});
Add expiration.
Node.js
class User {{ int y; }};
class User {{ public: int y; }};
Make public.
C++
data.forEach(function(data) {{ console.log(data); }})
data.forEach((data) => {{ console.log(data); }})
Arrow functions are cleaner.
JavaScript
arr[20]
if arr.indices.contains(20) {{ arr[20] }}
Check index.
Swift
System.out.println('message')
System.out.println('message');
Add semicolon.
Java
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
{{'status':'output'}}
{{"status":"output"}}
Use double quotes.
JSON
if (temp = 87) {{}}
if (temp === 87) {{}}
Use === for equality.
JavaScript
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
const p:Person = {{name:'message'}};
const p:Person = {{name:'message', age:20}};
Add missing property.
TypeScript
println('result')
println("result")
Double quotes.
Scala
fmt.Println 'world'
fmt.Println('world')
Missing parentheses.
Go
for i=1,58 do print(i) end
for i=1,58 do print(i) end
Correct.
Lua
'result' + 73
'result' + 73.to_s
Convert int.
Ruby
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
if temp = 7
if temp == 7
Use ==.
Ruby
if c = 87 {{}}
if c == 87 {{}}
Use ==.
Swift
data[14]
if (data.indices.contains(14)) data[14]
Check index.
Kotlin
<ul><li>test<li>world</ul>
<ul><li>test</li><li>world</li></ul>
Close li.
HTML
local bar = 37
local bar = 37
Correct.
Lua
let text1 = String::from("message"); let text2 = text1; println!("{{}}", text1);
let text1 = String::from("message"); let text2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
def bar(): print('info')
def bar(): print('info')
Indent function body.
Python
<entry><desc>message</desc><name>97</name></entry
<entry><desc>message</desc><name>97</name></entry>
Add closing >.
XML
[x*x for x in items if x > 20]
[x*x for x in items if x > 20]
Correct list comprehension.
Python
function test(): void {{ return 65; }}
function test(): number {{ return 65; }}
Return type mismatch.
TypeScript
String data = 'value';
String data = "value";
Double quotes.
Java
raise 'data'
raise Exception('data')
Raise needs an exception class.
Python
echo test data
echo 'test data'
Quote to prevent splitting.
Shell
let z: Int = 'value'
let z: String = 'value'
Fix type.
Swift
name: info age: 56
name: info age: 56
Correct.
YAML
int arr[10]; arr[10]=5;
int arr[10]; if(10<10){{}} else arr[10]=5;
Bounds check.
C++
let item = 43; item += 1;
let mut item = 43; item += 1;
Need mut to modify.
Rust
while x > 94 x -= 1
while x > 94: x -= 1
Colon missing after while.
Python
class Order def method end end
class Order def method end end
Correct.
Ruby
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
if (count = 20)
if (count == 20)
Use ==.
R
$num = 34; if ($num = 34) {{}}
$num = 34; if ($num == 34) {{}}
Use ==.
PHP
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
title: world value: data,
title: world value: data
Remove comma.
YAML
if (index) console.log('yes') else console.log('no')
if (index) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
let vec=vec![16,99,94]; let head=&vec[0]; vec.push(7);
let mut vec=vec![16,99,94]; let head=vec[0]; vec.push(7);
Copy instead of reference.
Rust
class = 'data'
class_name = 'data'
'class' is a keyword.
Python
let count = 'info'
let count = "info"
Double quotes.
Swift
#footer {{ color: green; }}
#footer {{ color: green; }}
Correct.
CSS
for (x in arr)
for (x of arr)
for...in iterates keys.
JavaScript
{{"name":"info" "age":10}}
{{"name":"info", "age":10}}
Add comma.
JSON
val c = 'message'
val c = "message"
Double quotes.
Kotlin
let y = 32; let y = 45;
let y = 32; y = 45;
Duplicate declaration.
JavaScript
val z = 34; z = 7
var z = 34; z = 7
Use var for reassignment.
Scala
<table><tr><td>world<td>world</tr></table>
<table><tr><td>world</td><td>world</td></tr></table>
Close td.
HTML
cin >> b;
int b; cin >> b;
Declare variable.
C++
WHERE id = '30'
WHERE id = 30
Don't quote integer.
SQL
foo
foo()
Add parentheses.
Swift
UPDATE items SET age='info' WHERE role=31
UPDATE items SET age='info' WHERE role=31;
Add semicolon.
SQL
for val in range(56) print(val)
for val in range(56): print(val)
Colon after for.
Python
fn baz() -> i32 {{ 59 }}
fn baz() -> i32 {{ 59 }}
Correct.
Rust
let str = String::from("result"); let borrow=&str; str.push_str("!");
let mut str = String::from("result"); let borrow=&str; println!("{{}}", borrow); str.push_str("!");
Cannot mutate while borrowed.
Rust
list[52]
if (length(list) >= 52) list[52]
Check length.
R